Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
Unlock the full potential of your B58-powered Supra or BMW with the SPDZ1 True 4.5" Catless Downpipe—now delivered with a premium exhaust gasket included. Unlike many “4.5” downpipes on the market that neck down immediately after the turbo, ours maintains the full 4.5" internal diameter right to the transition point, eliminating restriction and allowing your turbo to breathe freely.
This is a high-performance, race-intended upgrade designed to drastically reduce backpressure, improve spool characteristics, and sharpen throttle response.
🌟 Key Features & Benefits
True 4.5" full-length flow — no early step-downs or chokes, for maximum gas throughput
Bolt-on fitment — mates directly to your OEM or aftermarket exhaust (no major modifications required)
304 stainless steel construction — corrosion-resistant and built for durability
O2 sensor bungs retained — plug-and-play compatibility with factory sensors
Aggressive, raw exhaust note — delivers the roar your B58 is capable of
🚗 Fitment & Compatibility
Designed for Gen 1 and Gen 2 B58 engines, this downpipe is compatible with a wide range of BMW and Toyota Supra models:
Toyota: A90 / A91 Supra 3.0L (2020+)
BMW (Gen 1 & Gen 2 B58): M240i, 340i, 440i, 540i, 740i, X3 M40i, X4 M40i, etc.
Works for both Left-Hand Drive and Right-Hand Drive variants
Fits OEM and most aftermarket Cat-Back systems
Note: This is an off-road / track use component. Use may be restricted or illegal in some jurisdictions — always verify local emissions laws before installation.
💥 Performance Gains & Driving Feel
When paired with a proper tune, users typically see 30+ wheel horsepower increases on stock turbos. Expect:
Sharper turbo spool & reduced lag
Lower backpressure under load
Stronger midrange torque
More aggressive, raw exhaust sound
Because your SPDZ1 retains full 4.5" ID through its length (before transitioning to the stock or aftermarket midpipe), you avoid the common pitfall of early diameter reduction seen in many “4.5” downpipes. Many competitors taper down almost immediately after the turbo outlet—ours does not.
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
